***Gravity Load Application Failed!!!

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mklahyghan
Posts: 3
Joined: Sun Dec 13, 2015 10:26 pm
Location: IIT Bombay

***Gravity Load Application Failed!!!

Post by mklahyghan » Sat Apr 02, 2016 9:16 pm

Hi,

I am using a space frame building model which is of the same format as in Dr. Curt Haselton's models on the page

http://www.csuchico.edu/structural/rese ... base.shtml

To create a new model I have downloaded the zip file from the following link

http://www.csuchico.edu/structural/docu ... ks/4-3.zip

A zip file was be downloaded which contains a file named ModelCodePastedFromExcelVBA.tcl

I have defined all the parameters of the new model in the same format of this file and changed the Acol, ABm, Econcr and Building Geometry parameters in the file DefineVariablesAtMeanValues.tcl

I am trying to run "RunMeanAnalysis.tcl" in Opensees.exe but I am encountering the following error

WARNING SuperLU::solve(void)- Error 2 returned in factorization dgstrf()
WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve()
StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with domain at
load factor 0.2
OpenSees > analyze failed, returned: -3 error flag
*** Gravity Load application failed!!!

I have checked the connectivity of elements a number of times and there doesn't seem to be an error with that. A forum post previously suggested to check the theta_cap for the model to ensure it is not zero. My lowest value is 0.007904026 (is it too low?). I wish to know where else the error might be.

I would be highly grateful if you could help me. Thank You.
Yours Sincerely,
Mukul Ghan

fmk
Site Admin
Posts: 5883
Joined: Fri Jun 11, 2004 2:33 pm
Location: UC Berkeley
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Re: ***Gravity Load Application Failed!!!

Post by fmk » Mon Apr 04, 2016 10:37 am

if the original ran i suggest you start with the working version and then make incremental changes to that until you find out what change is casuing the problem. if the original fails send curt an email.

mklahyghan
Posts: 3
Joined: Sun Dec 13, 2015 10:26 pm
Location: IIT Bombay

Re: ***Gravity Load Application Failed!!!

Post by mklahyghan » Thu Apr 07, 2016 10:10 pm

Thank You very much Sir.

The original code from Prof. Curt Haselton worked

I later started commenting out the code to convert the 4 story-3 bay structure to 3 story- 2 bay structure and that is when the error arises. I ensured that the nodes are properly defined with respect to a 3 story- 2 bay structure and also modelled the Joint 2D elements accordingly.
Yours Sincerely,
Mukul Ghan

mklahyghan
Posts: 3
Joined: Sun Dec 13, 2015 10:26 pm
Location: IIT Bombay

Re: ***Gravity Load Application Failed!!!

Post by mklahyghan » Wed Apr 13, 2016 10:43 am

The problem was solved.

The leaning column needed some non-zero stiffness for the structure to be stable. Previously as I was giving a zero stiffness it was unable to apply the gravity loads.
Yours Sincerely,
Mukul Ghan

Prafullamalla
Posts: 160
Joined: Mon Feb 02, 2015 6:32 pm

Re: ***Gravity Load Application Failed!!!

Post by Prafullamalla » Thu Nov 05, 2020 9:21 am

Is it possible to obtain the code
Prafulla Malla, Nepal
Praf_malla@hotmail.com

selimgunay
Posts: 913
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: ***Gravity Load Application Failed!!!

Post by selimgunay » Sun Nov 08, 2020 4:53 pm

You can find an example with leaning columns here: https://opensees.berkeley.edu/wiki/inde ... ment_Frame


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